Propagation on Overhead Transmission Lines II-Earth-Conduction Effects and Practical Results

This paper will discuss the magnitude of earth correction terms calculated from available references. It is concluded that Carson´s earth correction terms are predominant, and curves detailing the magnitude of these are presented. Examples showing the magnitude of Carson´s earth correction terms for a given line at 60 c/s, 50 kc/s, and 1 Mc/s are shown. A modal analysis, using the technique developed in a companion paper, shows the effect of the earth correction terms on the modes of propagation and confirming field test results are given.